When the skin is exposed to ultraviolet rays, the skin produces a molecule that is turned into Vitamin D.
Sun is the source of ultraviolet rays important for Vitamin D production. Due to this reason, in the case of Vitamin D deficiency, it is recommended by doctor's to absorb sunlight by skin. The Vitamin D production occurs specifically by UV B rays rays which lie in the range of 290-315 nanometer.
The chemical 7-dehydrocholesterol absorbs these rays and convert to previtamin D3. Further, previtamin D3 isomerizes to Vitamin D. Other than sunlight, Vitamin D can be taken through diet. The sources include seafood like fish, fish oil, dairy products, beef liver etc. Vitamin D is required for bone and teeth formation, muscle contraction, immune system etc.
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Answer:
Size of the court
Explanation:
In the game of tennis, there could be a singles match typically involving just two players, or a doubles tennis which involves four players. The rule modified for the doubles tennis is that a wider court is used since there are more players involved.
Each player can serve the tennis after the fourth game. The server and receiver can stand at any side of the court even though it is ideal that they maintain one side.
It's important to take your time in any game that requires focus, strategy, and quick thinking - while you have to be in physical shape for baseball, you also have to have the mental capacity to be aware of every thing around you and look for the perfect opportunity to make any move so that you can make the best possible move.
Examples: (Hitting the ball at the perfect time with the right amount of force, knowing when it's safe to run home or if you need to stop at what ever base, being aware of where the ball is at all times, knowing where/who to throw the ball to when you want to get someone out, knowing how to pitch the ball to trick the batter.)
10) -itis
11) Trans
12) Hyperemesis
13) Suffix
This can result in injury and punishment
